Cast pipe and apparatus for making pipe



W. H. MILLSPAUGH CAST PIPE AND APPARATUS FOR MAKING PIPE June 12, 1928.

Filed March 16, 1926 R\ \\\\\m /s\\\\ lNVENTOR Wz'lh'am H. Ml'lispauy/z.

I BY ,w lwukd/ ATTOR Y5 Patented June 12-, 1928.

- UNITED STATES PATENT,

1,673,013 OFFICE.

WILLIAM H. MILLSPAUGH, or QSANDUSKY, omo, nssrenon r0 THE rerun. AND TEXTILE MACHINERY COMPANY, or SANDUSKY, OHIO, A conronarron or OHIO.

Application filed March 16, 1926. Serial No. 95,021.

This invention relates to cast pipe and to ap aratus for casting pipe.

s is well shown, cast pipe is-usually provided with an annular bead at one end and with a bell at the other end. When such pipes are joined to ether, the bead of one pipe is placed in the ell of the adjacent pipe and the joint is caulkedwith lead or other suitable packing. I

The usual construction of cast pipe has its annular bead extending beyond the outer peripheral surface of the pipe, or, in other words, the outside diameter of the head is greater than the outside diameter of the cylindrical portion of the pipe. When such a pipe is cast centrifugally in a non-parting mold, the bead prevents the withdrawal of the pipe longitudinally from the mold.

One object of the inventionis to provide a metal core for forming a head on a pipe and so constructed that the pipe and core can be removed from the mold without parting or splitting the mold. f

Another object of the invention is to provide ametal core adapted to be used in centrifugal casting machines to form an annular bead on the pipe having a diameter not greater than the outside diameter of the cylindrical portion of the pipe.

Another object of the invention is to provide a metal core for use. in centrifugal casting machines to form an-annular groove in the outside surface of the pipe.

Another object of the invention is to provide a tool for positioning a metal core in a centrifugal mold. I

Further objects of the invention will appear from the following specification taken in connection with the drawings, which form a part of this application, and in which I .Fig. 1 is a sectional elevation showing two pipe sections joined together;

Fig. 2 is alongitudinal sectional elevation showing a mold for a centrifugal casting machine and one means for positioning the metal core in the mold;

Fig. 3 is a longitudinal sectional elevation of the centrifugal mold with the metal core positioned therein and the metal cast in the mold;

Fig. 4 is a perspective view of the metal core for formlng an annular groove in the pi e, and

' g. 5 is a sectional elevation broken away and showing a slightly modified form of metal core.

The invention briefly described consists of a split metal ring ada ted for insertion in the mold of a centri ugal casting machine. The ring is properly positioned in the shield and located in a position spaced from one end of the mold by any suitable means and is frictionally held in position by reason of the resiliency of the ring. When the molten metal is cast centrifugally in the mold, the metal core will form an annular groove having the desired contour and shape. After the casting has been made, thepipe and ring can be withdrawn longitudinally from the mold and thereafter the ring can be sprung or broken out of the, groove and removed therefrom. Furfrom the following description. In Fig. 1 there are shown two pipes A and B. Each pipe has a bell 10 formed on one end thereof and an annular bead 11 formed at the other end thereof, the intermediate portion or major portion 12 of the pipe being substantially cylindrical. It will e noted that the outer surface of the end portion of the pipe adjacent the bead 11 is tapered toward the axis-of the pipe as shown at. 13 and it will be further noted that the outside diameter of the head 11 is sub stantially the same as the outside diameter of the cylindrical portion 12 of the pipe.

When the pipes or-pipe sections are as sembled as shown in Fig. 1, the head 11 of one pipe is disposed within the bell 10 of the adjacent pipe and caulking 14 of lead or other suitable material is placed insidethe' bell to seal thejoint.

Fig. 3 illustrates a metal flask or casing 20 of a centrifugal casting machine having an enlar ed end 21 shaped to form the bell end of t e pipe. A cap or plate 22 is secured to the end. 21 and has aninwardly extending tubular ortion 23 which supports a sand core 24 a apted to'coact with the end 21 of the mold and form the bell. The plate 22 and sand core 24 can be constructed and supported in any desired manner, for instance, as shown in my Patent No. 1,483,- 3721 granted February 12, 1924.

The opposite end,of the flask 20 has secured-thereto a plate 30 and a metal core in the form of a split metal ring 31 is located in a position spaced from the end of It will be evident fromithe the mold or flask .20 to which the plate 30 face of the pipe. The sides 34'and 35 are shown as parallel but may have any desired contour.

One form of tool for positioning the metal core in the flask is illustrated in Fig. 2 and consists of a disk 40 having a handle or rod 41 secured thereto and having secured to and projecting from one face, spacing members 42. The members 42 are so dimensioned" as to length that'they will properly space the metal core 31 from the end of the mold when the free ends of the members 42 engage the plate 30. After the ring or core has been.'po'sitioned in the mold by means of the tool just described, the tool is-withdrawn.

foregoing description that when the molten metal is poured into the rotating flask 20, the metal will be thrown outwardly by centrifugal force and will form a centrifugal casting having by the contour of the mold and in this instance, the casting will have an annular tapered groove formed therein adjacent one end thereof. This tapered groove will in turn form a bead 11 on the end of the pipe and the outside diameter of the bead will be the sameas the outside diameter of the cylindrical portion of the pipe.

If desired, the mold may be so constructed as to form a bead at the end of the pipe having a diameter slightly less than the outside diameter of the pipe and such a core is shown in Fig. 5. In this construction as in the foregoing, the metal core consists of a split rin formed of resilient material and having a substantially cylindrical the shape and contour determinedouter surface 51. The inner wall of the flask 20 has an annular, inwardly extending fiangle 52 which reduces the outer diameter of t e bead formed on the end .of the pipe.

After the casting formed in the centrifugal flask has cooled, the casting and ring can be withdrawn longitudinally from the mold whereupon the metal core or split ring can be sprung out of or, if necessary, broken out of the groove.

Although certain specific embodiments of the'invention have been particularly shown and described, it will be understood that the invention is capable of modification and that changes in the construction and in the arrangement of the various cooperating parts may be made without departing from the spirit or scope of the invention, as expressedin the following claims.

What I claim is: r

1. A metal core for forming an annular groove in a pipe casting, consisting of a split metallic ring-of resilient material and having a cylindrical outer surface adapted to fit against the inner surface of the mold.

2. A metal core for forming an annular groove in an annular casting, consisting of a split metal ring having an inside diameter less than the inside diameter of the mold, the outer surface of the ring being substantially cylindrical.

3. A metal core for forming an annular groove in an annular casting, consisting of a split metal ring having an inside diameter less than the inside diameter of the mold, the inner surface of said ring'being tapered.

4. Av metal core consistin of .a split ring having its cross section confbrming in shape to a trapezium.

5. A metal core for forming an annular groove in the outer surface of an annular casting, said core consisting, of a split metal ring formed of resilient material and having a substantially cylindrical outer surface and a tapered inner surface.

In witness whereof, I have hereunto set my hand this 8th .da of March, 1926. v WILLIAM MILLSPAUGH. 

